We know SUS304 pipes have high heat resistance ability so they are used in heating furnaces as well as used in recuperators or gas heat exchangers that require strong heat resistance ability. We have conducted several internal tests to compare the ability of heat resistance between stainless steel SUS304 and our home made Daiwa Aluminum Calorizing steel pipe. The results clearly indicate which of the two samples demonstrates superior heat resistance.
We have two samples of these two products. Let’s explore the characteristics of these two samples to understand their potential in heat resistance.
For the first time, we put the two samples into a furnace then heated them to the temperature of 1,050 oC in 15 hours. The SUS304 pipe burned and peeled off a layer with a thickness of about 0.15mm, while the Aluminum calorizing steel pipe did not burn and peel off like the SUS304 pipe.
For the second time, we put the two samples into a furnace then heated them to the temperature of 1,050 oC in 15 hours. The SUS304 pipe burned and peeled off a layer with a thickness of about 0.18mm, while the Aluminum calorizing steel pipe did not burn and peel off like the SUS304 pipe.
Looking under the microscope, we see that the thickness of the SUS304 pipe is much thinner after 2 times heating. A mReplace AllicReplace AllrReplace AlloscopicReplace All Replace AllcReplace AlloReplace AllmReplace AllpReplace AllarReplace AllisReplace AlloReplace Alln Replace AlloReplace AllfReplace All Replace Allwall thickness before and after heating is presented in the table below.Replace All
| Name of Sample |
Wall Thickness Before Heating |
Wall Thickness After Heating | Wear level of steel by heated | Level of different |
| Aluminized Steel Pipe | 2.217 mm | 2.171 mm | 23 micron |
The wear level of wall thickness of SUS304 is 7 times faster than Aluminized Steel Pipe. |
| SUS304 | 2.007 mm | 1.678 mm | 164.5 micron | |
| Result: The Aluminized Steel Pipe's heat resistance was 7 times greater than SUS304. | ||||
After heating twice, we placed two samples into a furnace and heated them to the temperature of 1,050 oC in 15 hours. The Aluminized steel pipe burned and peeled off a layer with a thickness of about 0.046mm. While SUS304 burned and peeled off a layer with a thickness of about 0.329mm. We observed that the Aluminized steel pipe’s heat resistance was 7 times greater than SUS304.
Heat resistance is crucial for heat exchanger pipes because it ensures the pipes can withstand high temperatures without degrading, maintaining operational efficiency and safety. It is especially important in the recuperator type of heat exchanger where working temperatures range from 600 oC to 900 oC. The heat resistant ability of aluminized steel pipe is far above this temperature range.
There will be other factors to consider for heat exchanger pipes, such as thermal conductivity and corrosion resistance, but if the pipes cannot withstand the high temperature and pressure, it is likely that it cannot help extend the lifespan of heat exchangers, increasing the need for frequent replacements and maintenance.
The performance of aluminized calorizing steel pipe is superior to SUS304. Daiwa Aluminined steel pipe made by Daiwa Lance is an excellent replacement for SUS304 in terms of heat resistance for use in heating furnaces, recuperators or gas heat exchangers. The Daiwa Aluminized steel pipe is not only superior to SUS304 stainless pipe in heat resistant ability, but it is also greater in cost effectiveness due to the price of Aluminized steel pipe is much lower than that of SUS304 stainless pipe.
Experience the superior heat resistance of Daiwa Aluminized steel pipe. Please contact Daiwa Lance today to get the customized products you need for your heating systems.